feat: vault core/CLI/workbench, vaultd token path, filetree view-state cleanup

Land password-vault dedicated workbench and mnote-vault-core/CLI, agent token
read path design, vault transport split, and retire obsolete filetree smokes.
Ignore local vault reimport scripts that trip secret scanners.

rust/Cargo.toml

@@ -8,6 +8,8 @@ members = [
   "crates/event-log",
   "crates/mnote-editor-core",
   "crates/mnote-cli",
+  "crates/mnote-vault-core",
+  "crates/mnote-vault",
   "crates/mnote-web",
   "crates/index-fts",
   "crates/tree-shell-runtime-wasm",